optimising a push by fetching objects from nearby repos

Hi,

Is there a trick to optimising a push by telling the receiver to pick up missing objects from some other repo on its own server, to cut down even more on network traffic?

So, hypothetically,

     git push user@host:repo1 --look-for-objects-in=repo2

I'm aware of the alternates mechanism, but that makes the dependency on the other repo sort-of permanent. I'm looking for a temporary dependence, just for the duration of the push. Naturally, the objects should be brought into the target repo for that to happen, except that this would be doing more from disk and less from the network.

My gut says this isn't possible, and I've searched enough to almost be sure, but before I give up, I wanted to ask.

thanks sitaram

Milki: I'm sure you won't mind the cc, since you know the context :-)